/*
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.l2j.gameserver.model.actor.instance;

import static net.sf.l2j.gameserver.ai.CtrlIntention.AI_INTENTION_IDLE;

import java.util.concurrent.Future;

import javolution.util.FastMap;
import net.sf.l2j.gameserver.ThreadPoolManager;
import net.sf.l2j.gameserver.ai.CtrlIntention;
import net.sf.l2j.gameserver.datatables.SkillTable;
import net.sf.l2j.gameserver.model.L2ItemInstance;
import net.sf.l2j.gameserver.model.L2Object;
import net.sf.l2j.gameserver.model.L2Skill;
import net.sf.l2j.gameserver.model.actor.L2Character;
import net.sf.l2j.gameserver.network.serverpackets.AbstractNpcInfo;
import net.sf.l2j.gameserver.network.serverpackets.StopMove;
import net.sf.l2j.gameserver.templates.chars.L2NpcTemplate;
import net.sf.l2j.gameserver.templates.skills.L2SkillType;
import net.sf.l2j.util.Point3D;
import net.sf.l2j.util.Rnd;

// While a tamed beast behaves a lot like a pet (ingame) and does have
// an owner, in all other aspects, it acts like a mob.
// In addition, it can be fed in order to increase its duration.
// This class handles the running tasks, AI, and feed of the mob.
// The (mostly optional) AI on feeding the spawn is handled by the datapack ai script
public final class L2TamedBeastInstance extends L2FeedableBeastInstance
{
private int _foodSkillId;
private static final int MAX_DISTANCE_FROM_HOME = 30000;
private static final int MAX_DISTANCE_FROM_OWNER = 2000;
private static final int MAX_DURATION = 1200000;	// 20 minutes
private static final int DURATION_CHECK_INTERVAL = 60000;	// 1 minute
private static final int DURATION_INCREASE_INTERVAL = 20000;	// 20 secs (gained upon feeding)
private static final int BUFF_INTERVAL = 5000;	// 5 seconds
private int _remainingTime = MAX_DURATION;
private int _homeX, _homeY, _homeZ;
private L2PcInstance _owner;
private Future<?> _buffTask = null;
private Future<?> _durationCheckTask = null;

public L2TamedBeastInstance(int objectId, L2NpcTemplate template)
{
	super(objectId, template);
	setHome(this);
}

public L2TamedBeastInstance(int objectId, L2NpcTemplate template, L2PcInstance owner, int foodSkillId, int x, int y, int z)
{
	super(objectId, template);
	
	setCurrentHp(getMaxHp());
	setCurrentMp(getMaxMp());
	setOwner(owner);
	setFoodType(foodSkillId);
	setHome(x,y,z);
	this.spawnMe(x, y, z);
}

public void onReceiveFood()
{
	// Eating food extends the duration by 20secs, to a max of 20minutes
	_remainingTime = _remainingTime + DURATION_INCREASE_INTERVAL;
	if (_remainingTime > MAX_DURATION)
		_remainingTime = MAX_DURATION;
}

public Point3D getHome()
{
	return new Point3D(_homeX, _homeY, _homeZ);
}

public void setHome(int x, int y, int z)
{
	_homeX = x;
	_homeY = y;
	_homeZ = z;
}

public void setHome(L2Character c)
{
	setHome(c.getX(), c.getY(), c.getZ());
}

public int getRemainingTime()
{
	return _remainingTime;
}

public void setRemainingTime(int duration)
{
	_remainingTime = duration;
}

public int getFoodType()
{
	return _foodSkillId;
}

public void setFoodType(int foodItemId)
{
	if (foodItemId > 0)
	{
		_foodSkillId = foodItemId;
		
		// start the duration checks
		// start the buff tasks
		if (_durationCheckTask != null)
			_durationCheckTask.cancel(true);
		_durationCheckTask = ThreadPoolManager.getInstance().scheduleGeneralAtFixedRate(new CheckDuration(this), DURATION_CHECK_INTERVAL, DURATION_CHECK_INTERVAL);
	}
}

@Override
public boolean doDie(L2Character killer)
{
	if (!super.doDie(killer))
		return false;
	
	getAI().stopFollow();
	if (_buffTask != null)
		_buffTask.cancel(true);
	if (_durationCheckTask != null)
		_durationCheckTask.cancel(true);
	
	// clean up variables
	if (_owner != null)
		_owner.setTrainedBeast(null);
	_buffTask = null;
	_durationCheckTask = null;
	_owner = null;
	_foodSkillId = 0;
	_remainingTime = 0;
	return true;
}

public L2PcInstance getOwner()
{
	return _owner;
}

public void setOwner(L2PcInstance owner)
{
	if (owner != null)
	{
		_owner = owner;
		setTitle(owner.getDisplayName());
		// broadcast the new title
		broadcastPacket( new AbstractNpcInfo.NpcInfo(this, owner) );
		
		owner.setTrainedBeast(this);
		
		// always and automatically follow the owner.
		getAI().startFollow(_owner,100);
		
		// instead of calculating this value each time, let's get this now and pass it on
		int totalBuffsAvailable = 0;
		for (L2Skill skill: getTemplate().getSkills().values())
		{
			// if the skill is a buff, check if the owner has it already [  owner.getEffect(L2Skill skill) ]
			if (skill.getSkillType() == L2SkillType.BUFF)
				totalBuffsAvailable++;
		}
		
		// start the buff tasks
		if (_buffTask !=null)
			_buffTask.cancel(true);
		_buffTask = ThreadPoolManager.getInstance().scheduleGeneralAtFixedRate(new CheckOwnerBuffs(this, totalBuffsAvailable), BUFF_INTERVAL, BUFF_INTERVAL);
	}
	else
	{
		doDespawn();	// despawn if no owner
	}
}

public boolean isTooFarFromHome()
{
	return !(this.isInsideRadius(_homeX, _homeY, _homeZ, MAX_DISTANCE_FROM_HOME, true, true));
}

public void doDespawn()
{
	// stop running tasks
	getAI().stopFollow();
	_buffTask.cancel(true);
	_durationCheckTask.cancel(true);
	stopHpMpRegeneration();
	
	// clean up variables
	if (_owner != null)
		_owner.setTrainedBeast(null);
	setTarget(null);
	_buffTask = null;
	_durationCheckTask = null;
	_owner = null;
	_foodSkillId = 0;
	_remainingTime = 0;
	
	// remove the spawn
	onDecay();
}

// notification triggered by the owner when the owner is attacked.
// tamed mobs will heal/recharge or debuff the enemy according to their skills
public void onOwnerGotAttacked(L2Character attacker)
{
	// check if the owner is no longer around...if so, despawn
	if ((_owner == null) || (_owner.isOnline()==0) )
	{
		doDespawn();
		return;
	}
	// if the owner is too far away, stop anything else and immediately run towards the owner.
	if (!_owner.isInsideRadius(this, MAX_DISTANCE_FROM_OWNER, true, true))
	{
		getAI().startFollow(_owner);
		return;
	}
	// if the owner is dead, do nothing...
	if (_owner.isDead())
		return;
	
	// if the tamed beast is currently in the middle of casting, let it complete its skill...
	if(isCastingNow())
		return;
	
	float HPRatio = ((float) _owner.getCurrentHp())/_owner.getMaxHp();
	
	// if the owner has a lot of HP, then debuff the enemy with a random debuff among the available skills
	// use of more than one debuff at this moment is acceptable
	if (HPRatio >= 0.8)
	{
		FastMap<Integer, L2Skill> skills = (FastMap<Integer, L2Skill>) getTemplate().getSkills();
		
		for (L2Skill skill: skills.values())
		{
			// if the skill is a debuff, check if the attacker has it already [  attacker.getEffect(L2Skill skill) ]
			if ((skill.getSkillType() == L2SkillType.DEBUFF) && Rnd.get(3) < 1 && (attacker != null && attacker.getFirstEffect(skill) != null))
			{
				sitCastAndFollow(skill, attacker);
			}
		}
	}
	// for HP levels between 80% and 50%, do not react to attack events (so that MP can regenerate a bit)
	// for lower HP ranges, heal or recharge the owner with 1 skill use per attack.
	else if (HPRatio < 0.5)
	{
		int chance = 1;
		if (HPRatio < 0.25 )
			chance = 2;
		
		// if the owner has a lot of HP, then debuff the enemy with a random debuff among the available skills
		FastMap<Integer, L2Skill> skills = (FastMap<Integer, L2Skill>) getTemplate().getSkills();
		
		for (L2Skill skill: skills.values())
		{
			// if the skill is a buff, check if the owner has it already [  owner.getEffect(L2Skill skill) ]
			if ( (Rnd.get(5) < chance) && ((skill.getSkillType() == L2SkillType.HEAL) ||
					(skill.getSkillType() == L2SkillType.HOT) ||
					(skill.getSkillType() == L2SkillType.BALANCE_LIFE) ||
					(skill.getSkillType() == L2SkillType.HEAL_PERCENT) ||
					(skill.getSkillType() == L2SkillType.HEAL_STATIC) ||
					(skill.getSkillType() == L2SkillType.SUPER_HEAL) ||
					(skill.getSkillType() == L2SkillType.COMBATPOINTHEAL) ||
					(skill.getSkillType() == L2SkillType.CPHOT) ||
					(skill.getSkillType() == L2SkillType.MANAHEAL) ||
					(skill.getSkillType() == L2SkillType.MANA_BY_LEVEL) ||
					(skill.getSkillType() == L2SkillType.MANAHEAL_PERCENT) ||
					(skill.getSkillType() == L2SkillType.MANARECHARGE) ||
					(skill.getSkillType() == L2SkillType.MPHOT) )
			)
			{
				sitCastAndFollow(skill, _owner);
				return;
			}
		}
	}
}

/**
 * Prepare and cast a skill:
 *   First smoothly prepare the beast for casting, by abandoning other actions
 *   Next, call super.doCast(skill) in order to actually cast the spell
 *   Finally, return to auto-following the owner.
 *
 * @see net.sf.l2j.gameserver.model.actor.L2Character#doCast(net.sf.l2j.gameserver.model.L2Skill)
 */
protected void sitCastAndFollow(L2Skill skill, L2Character target)
{
	stopMove(null);
	broadcastPacket(new StopMove(this));
	getAI().setIntention(AI_INTENTION_IDLE);
	
	setTarget(target);
	doCast(skill);
	getAI().setIntention(CtrlIntention.AI_INTENTION_FOLLOW, _owner);
}

private class CheckDuration implements Runnable
{
private L2TamedBeastInstance _tamedBeast;

CheckDuration(L2TamedBeastInstance tamedBeast)
{
	_tamedBeast = tamedBeast;
}

public void run()
{
	int foodTypeSkillId = _tamedBeast.getFoodType();
	L2PcInstance owner = _tamedBeast.getOwner();
	_tamedBeast.setRemainingTime(_tamedBeast.getRemainingTime() - DURATION_CHECK_INTERVAL);
	
	// I tried to avoid this as much as possible...but it seems I can't avoid hardcoding
	// ids further, except by carrying an additional variable just for these two lines...
	// Find which food item needs to be consumed.
	L2ItemInstance item = null;
	if (foodTypeSkillId == 2188)
		item = owner.getInventory().getItemByItemId(6643);
	else if (foodTypeSkillId == 2189)
		item = owner.getInventory().getItemByItemId(6644);
	
	// if the owner has enough food, call the item handler (use the food and triffer all necessary actions)
	if (item != null && item.getCount() >= 1)
	{
		L2Object oldTarget = owner.getTarget();
		owner.setTarget(_tamedBeast);
		L2Object[] targets = {_tamedBeast};
		
		// emulate a call to the owner using food, but bypass all checks for range, etc
		// this also causes a call to the AI tasks handling feeding, which may call onReceiveFood as required.
		owner.callSkill(SkillTable.getInstance().getInfo(foodTypeSkillId, 1), targets);
		owner.setTarget(oldTarget);
	}
	else
	{
		// if the owner has no food, the beast immediately despawns, except when it was only
		// newly spawned.  Newly spawned beasts can last up to 5 minutes
		if (_tamedBeast.getRemainingTime() < MAX_DURATION - 300000)
			_tamedBeast.setRemainingTime(-1);
	}
	
	/* There are too many conflicting reports about whether distance from home should
	 * be taken into consideration.  Disabled for now.
	 *
    		if (_tamedBeast.isTooFarFromHome())
    			_tamedBeast.setRemainingTime(-1);
	 */
	
	if (_tamedBeast.getRemainingTime() <= 0)
		_tamedBeast.doDespawn();
}
}

private class CheckOwnerBuffs implements Runnable
{
private L2TamedBeastInstance _tamedBeast;
private int _numBuffs;

CheckOwnerBuffs(L2TamedBeastInstance tamedBeast, int numBuffs)
{
	_tamedBeast = tamedBeast;
	_numBuffs = numBuffs;
}

public void run()
{
	L2PcInstance owner = _tamedBeast.getOwner();
	
	// check if the owner is no longer around...if so, despawn
	if ((owner == null) || (owner.isOnline()==0) )
	{
		doDespawn();
		return;
	}
	// if the owner is too far away, stop anything else and immediately run towards the owner.
	if (!isInsideRadius(owner, MAX_DISTANCE_FROM_OWNER, true, true))
	{
		getAI().startFollow(owner);
		return;
	}
	// if the owner is dead, do nothing...
	if (owner.isDead())
		return;
	// if the tamed beast is currently casting a spell, do not interfere (do not attempt to cast anything new yet).
	if (isCastingNow())
		return;
	
	int totalBuffsOnOwner = 0;
	int i=0;
	int rand = Rnd.get(_numBuffs);
	L2Skill buffToGive = null;
	
	// get this npc's skills:  getSkills()
	FastMap<Integer, L2Skill> skills = (FastMap<Integer, L2Skill>) _tamedBeast.getTemplate().getSkills();
	
	for (L2Skill skill: skills.values())
	{
		// if the skill is a buff, check if the owner has it already [  owner.getEffect(L2Skill skill) ]
		if (skill.getSkillType() == L2SkillType.BUFF)
		{
			if (i++==rand)
				buffToGive = skill;
			if(owner.getFirstEffect(skill) != null)
			{
				totalBuffsOnOwner++;
			}
		}
	}
	// if the owner has less than 60% of this beast's available buff, cast a random buff
	if (_numBuffs*2/3 > totalBuffsOnOwner)
	{
		_tamedBeast.sitCastAndFollow(buffToGive, owner);
	}
	getAI().setIntention(CtrlIntention.AI_INTENTION_FOLLOW, _tamedBeast.getOwner());
}
}
}
